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Consolidated Statements of Shareholders' Equity (USD $)
In Thousands, except Share data
Comprehensive Income [Member]
Common Shares [Member]
Treasury Stock [Member]
Additional Paid-in Capital [Member]
Accumulated Retained Earnings [Member]
Accumulated Other Comprehensive Income [Member]
Total
Balance at Jun. 30, 2008   $ 438,471   $ 39,330 $ 47,541 $ 110,819 $ 636,161
Balance (in shares) at Jun. 30, 2008   51,152,000          
Issuance of Common Shares              
Under employee stock option plans (in shares)   1,539,000          
Under employee stock option plans   18,727         18,727
Under employee stock purchase plans (in shares)   26,000          
Under employee stock purchase plans   784         784
Stock compensation       5,032     5,032
Income tax effect related to stock options exercised       7,790     7,790
Purchase of treasury stock (in shares)             0
Comprehensive income:              
Foreign currency translation adjustment (44,944)         (44,944) (44,944)
Change in actuarial gain (loss) relating to defined benefit pension plan 813         813 813
Unrealized gain on cash flow hedges 990         990 990
Unrealized holding gain on available-for-sale securities, net of tax 4,173         4,173 4,173
Net income for the year 56,938       56,938   56,938
Total comprehensive income 17,970            
Ending Balance at Jun. 30, 2009   457,982   52,152 104,479 71,851 686,464
Ending Balance (in shares) at Jun. 30, 2009   52,717,000          
Issuance of Common Shares              
Under employee stock option plans (in shares)   474,000         474,444
Under employee stock option plans   8,941         8,941
Under employee stock purchase plans (in shares)   27,000          
Under employee stock purchase plans   997         997
In connection with acquisitions (in shares)   3,608,000          
In connection with acquisitions   134,948         134,948
Stock compensation       8,003     8,003
Income tax effect related to stock options exercised       1,143     1,143
Purchase of treasury stock (in shares)     (308,000)       307,579
Purchase of treasury stock     (14,000)       (14,000)
Comprehensive income:              
Foreign currency translation adjustment (20,393)         (20,393) (20,393)
Change in actuarial gain (loss) relating to defined benefit pension plan (2,274)         (2,274) (2,274)
Release of unrealized gain on cash flow hedges (990)         (990) (990)
Release of unrealized gain on available for sale securities (4,173)         (4,173) (4,173)
Net income for the year 89,212       89,212   89,212
Total comprehensive income 61,382            
Ending Balance at Jun. 30, 2010   602,868 (14,000) 61,298 193,691 44,021 887,878
Ending Balance (in shares) at Jun. 30, 2010   56,826,000 (308,000)        
Issuance of Common Shares              
Under employee stock option plans (in shares)   439,000         439,071
Under employee stock option plans   10,090         10,090
Under employee stock purchase plans (in shares)   31,000          
Under employee stock purchase plans   1,202         1,202
In connection with acquisitions (in shares)   6,000          
In connection with acquisitions   119   (119)      
Stock compensation       11,234     11,234
Income tax effect related to stock options exercised       1,888     1,888
Purchase of treasury stock (in shares)     (264,000)       264,834
Purchase of treasury stock     (12,499)       (12,499)
Comprehensive income:              
Foreign currency translation adjustment 15,388         15,388 15,388
Change in actuarial gain (loss) relating to defined benefit pension plan (214)         (214) (214)
Unrealized gain on cash flow hedges 1,275         1,275 1,275
Unrealized holding gain on available-for-sale securities, net of tax 411         411 411
Release of unrealized gain on available for sale securities (411)         (411) (411)
Net income for the year 123,203       123,203   123,203
Total comprehensive income 139,652            
Ending Balance at Jun. 30, 2011   $ 614,279 $ (26,499) $ 74,301 $ 316,894 $ 60,470 $ 1,039,445
Ending Balance (in shares) at Jun. 30, 2011   57,302,000 (572,000)